StackState provides monitors out of the box, which provide monitoring on common issues that can occur in a Kubernetes cluster. These monitors also contain out of the box remediation guides which are meant to guide users in accurately troubleshooting issues. They are created using the best practices and community knowledge. Follow the indications on this page to learn how to write an effective remediation guide yourself.
Guidelines
Provide step by step instructions to guide a user into solving the issue detected by the monitor;
Make sure the instructions are ordered by the most likely cause(s).
If possible, include links to relevant data and/or resources to speed up the investigation.
Keep it short and on point:
Avoid over explaining - add links to supporting documentation if that's the case;
Avoid using a table of contents and similar content blocks;
Avoid having a summary of the same content;
Try to format the guide in a structured way. Use:
bullet points
numbering
short sentences
paragraphs
inline formatted examples
If there are open ends (there might be different causes which are still unknown), provide guidance for escalating the issue. E.g. provide the user with a support link/ number, etc.
Remediation guide example
When a Kubernetes container has errors, it can enter into a state called CrashLoopBackOff, where Kubernetes attempts to restart the container to resolve the issue. The container will continue to restart until the problem is resolved.Take the following steps to diagnose the problem:
### Pod Events
Check the pod events to identify any explicit errors or warnings.
1. Go to the "Events" section in the middle of the [Pod highlight page](/#/components/\{{ componentUrnForUrl \}})
2. Check if there is are events like "BackOff", "FailedScheduling", "FailedAttachVolume" or "OOMKilled" in the Alert Category by clicking on 'Alerts'.
3. You can see the details of the event (click on the event) to give more information about the issue.
4. If the 'Show related event' option is enabled all events of resources related to this resource like a deployment will also show up and can give you a clue if any change on them is causing this issue. You can see this by checking if there is a correlation between the time of a deployment and a change of behaviour seen by the metrics and events of this pod.
For easy correlation you can use 'shift'-'click' to add markers to the different graph, log and event widgets.
### Container Logs
Check the container logs for any explicit errors or warnings
Inspect the [Logs](/#/components/\{{ componentUrnForUrl \}}#logs) of all the containers in this pod.
Search for hints in the logs by:
1. Looking for changes in logging pattern, by looking at the number of logs per time unit (The histogram bars).
In many cases the change in pattern will indicate what is going on.
You can click-drag on the histogram bars to narrow the logs displayed to that time-frame.
2. Searching for "Error" or "Fatal" in the search bar.
3. Looking at the logs around the time that the monitor triggered
### Recent Changes
Look at the pod age in the "About" section on the [Pod highlight page](/#/components/\{{ componentUrnForUrl \}}) to identify any recent deployments that might have caused the issue
1. The "Age" is shown in the "About" section on the left side of the screen
2. If the "Age" and the time that the monitor was triggered are in close proximity then take a look at the most recent deployment by clicking on [Show last change](/#/components/\{{ componentUrnForUrl \}}#lastChange).
Inserting links
The syntax we use is different for "deep links" vs "in-page links". The "deep links" will redirect the user from the current page, whilst the "in-page links" will keep the user on the same page.
Deep links
To link to any perspective (e.g. "hightlights", "topology", "events", "metrics") of the current resource, use the following syntax:
To link to any additional data (e.g. "show logs", "show last change", "show status", "show configuration") on the current resource, use the following syntax:
